consume - there is no charge when your code is not running. How AWS Lambda Works? The block diagram that explains the working of AWS Lambda in five easy steps is shown below: 1. AWS Lambda — API Gateway  Link lambda function to api gateway  Passing data to api gateway A basic diagram that explains the working of API gateway and AWS Lambda is given here: These processes user will be able to see the message in Cloudwatch logs once the file is uploaded. The block diagram that explains the flow of the example is shown here: 17. AWS Lambda — Using Lambda